calc_estimate_true_var
                        Estimate true group variance
dataobs                 Simulated observation data
dataobs_coda            Simulated observation of compositional data
datatrue                Simulated true data
datatrue_coda           Simulated true compositional data
force_posdef            Force positive definiteness
generalized_mean        Generalized mean
predict.vqda            predict.vqda
uncertainties           Simulated observation uncertainties
uncertainties_coda      Simulated observation uncertainties of
                        compositional data
vlda                    Weighted Linear Discriminant Analysis
vqda                    Weighted Quadratic Discriminant Analysis
